01 - Preheat oven to 400°F and line a baking sheet with parchment paper.
02 - Combine ground beef, onion, garlic, parsley, thyme, Worcestershire sauce, salt, pepper, and 1 beaten egg in a large bowl. Mix until thoroughly incorporated.
03 - Lay puff pastry sheets on lightly floured surface. Cut each sheet in half lengthwise to create 4 long strips.
04 - Divide beef mixture into 4 equal portions. Form each into a long log and place down center of each pastry strip. Fold pastry over filling and press edges firmly to seal.
05 - Place rolls seam-side down. Cut each roll into 3 equal pieces for 12 total. Arrange on prepared baking sheet.
06 - Whisk remaining egg with milk and brush over tops of rolls.
07 - Make small diagonal slits on top of each roll with sharp knife to allow steam ventilation.
08 - Bake for 20-25 minutes until pastry turns golden brown and filling is completely cooked through.
09 - Allow rolls to cool for 5 minutes before serving.